rebuilt optimized SCAD for rpi-zero-frame.scad, regenerate rpi-zero-frame.stl
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eltoozero
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// lee@braains.net pi zero frame for Einsy RAMBo 2020-07-18
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// b/c Prusa's SCAD is MIA
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// re: https://github.com/prusa3d/Original-Prusa-i3/issues/132
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// dimensions are derrived from the original STL, with some cleanup
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//color("red") translate([0,pizd[1],0]) translate([3.5,-3.5,4.5]) import("rpi-zero-frame.stl");
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// pi zero dimensions
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pizd=[65,30,4];
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// pin shroud thickness
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pinz=2.5;
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// pin clearance
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pc=1.8;
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// part thickness
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pt=2;
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// pcb thickness
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pcbt=1.4;
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inch=25.4;
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// f'n around
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$fn=32;
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final_part();
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module final_part(){
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difference(){
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base();
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pins_cut();
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hdmi_cut();
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usb_cut();
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inductor_cut();
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weight_loss();
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//mounting_fasteners();
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under_cuts();
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nice_cut();
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}
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}
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module base(){
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// inset for "shrunk" outer dims, matching OEM.
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translate([0.5,0.5,0])
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// base block
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cheese_slice(pizd[0]-1,pizd[1]-1,pt,6);
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// support columns & pegs
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translate([3.5,3.5,0]){
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for(x=[0:58:58]){
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for(y=[0:23:23]){
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// peg
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translate([x,y,0]) cylinder(d=2.70, h=pt+pinz+pcbt);
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// column
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translate([x,y,0]) cylinder(d=6, h=pt+pinz);
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}
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}
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}
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// braces around gpio pins
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arm_rests();
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// this isn't really needed, but it's on the OEM frame.
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arm_rest_flap();
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// support flap for SD Card side under cuts
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// could be shorter to save a little material
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hull(){
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translate([3.5,3.5,pt]) cylinder(d=6,h=pinz-1.5);
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translate([3.5,pizd[1]-3.5,pt]) cylinder(d=6,h=pinz-1.5);
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}
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// support flap for camera connector side
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// could also be shorter to save a little material
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hull(){
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translate([pizd[0]-3.5,0.5+3,pt]) cylinder(d=6,h=pinz-1.2);
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translate([pizd[0]-3.5,pizd[1]-3.5,pt]) cylinder(d=6,h=pinz-1.2);
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}
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// extension above USB power connector to prevent shorting.
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usb_flap();
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}
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module nice_cut(){
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// it bugged me, so I fixed it.
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translate([3.5,3.5+pizd[1]-7,pt-4.4+pinz+1])
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difference(){
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translate([-3,0,0]) cube([6,6,10]);
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cylinder(d=6,h=10);
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}
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}
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module pins_cut(){
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// all the pins
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// translate([(pizd[0]-inch*2)/2,3.5-(inch*.05),0])
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// for(x=[0:inch*.1:inch*2]){
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// for(y=[0:inch*.1:inch*.1]){
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// translate([x,y,0]) cylinder(d=1,h=20);
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// }
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// }
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// first four
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translate([(pizd[0]-inch*2)/2+inch*.05,3.5-(inch*.05),0])
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for(x=[inch*.1:inch*.1:inch*.4]){
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for(y=[0:inch*.1:0]){
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translate([x,y,0]) cylinder(d=1.6,h=20);
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}
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}
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// other two
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translate([(pizd[0]-inch*2)/2+inch*.05,3.5-(inch*.05),0])
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for(x=[inch*.7:inch*.1:inch*.7]){
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for(y=[0:inch*.1:inch*.1]){
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translate([x,y,0]) cylinder(d=1.6,h=20);
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}
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}
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}
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module inductor_cut(){
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translate([pizd[0]-5-6.5+2,10.5,pt+1.3-.6]) cheese_slice(5,5,.6,2);
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}
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module hdmi_cut(){
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translate([6.5,pizd[1]-8,pt-4.4+pinz+1]) cube([12,8,4.4]);
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}
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module usb_flap(){
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translate([47.7+1+3,pizd[1]-2.5,0]) cheese_slice(6,4,pt+.4,2);
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}
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module usb_cut(){
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//translate([47.7-10,pizd[1]-5.5,pt+pinz+1.6-4]) cube([20,7,4]);
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translate([47.7-10,pizd[1]-5.5,pt+pinz+1.6-4])
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cheese_slice(20,7,4,1);
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// nice edge for usb flange
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translate([48.5,pizd[1]-2.5+4,1.5]) rotate([45,0,0]) cube(10);
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}
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module weight_loss(){
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translate([6.5,6.5,0]) cube(pizd-[13,13,0]+[0,0,10]);
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}
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module under_cuts(){
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// sorry for the translate wrap, I manually shifted the geometry against
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// the abandoned rpi-zero-frame.stl.
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translate([0,pizd[1],0]){
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// under usb power input
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hull(){
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translate([54.7,-4.3,0]) twoby();
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translate([54.7,-4.3+inch*.2,0]) twoby();
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}
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// beside usb power input
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translate([54.7-inch*.25,-4.3-inch*.1,0]) twoby();
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// straddle cut on gpio side
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translate([34,-26,0]){
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hull(){
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twoby();
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translate([inch*.4,0,0]) twoby();
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}
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}
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// straddle cut above sd card slot
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translate([0,-8.4,0]) twoby();
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// through cut under sd card slot
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hull(){
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translate([2.3-inch*.1,-21,0]) twoby();
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translate([2.3+inch*.2,-21,0]) twoby();
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}
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// through cut gpio side
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hull(){
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translate([52.7,-26.3-inch*.2,0]) rotate([0,0,-90]) twoby();
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translate([52.7,-26.3+inch*.2,0]) rotate([0,0,-90]) twoby();
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}
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// corner cut (supports here)
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hull(){
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translate([3.6,-30.3,0]) twoby();
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translate([3.6-inch*.1,-30.3,0]) twoby();
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}
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} // end translate
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}
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module twoby(){
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// seemed like a good idea, got the job done
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hull(){
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cylinder(d=2.5,h=pc);
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translate([0,inch*.1,0]) cylinder(d=2.5,h=pc);
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}
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}
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module mounting_fasteners(){
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translate([3.5,(pizd[1]-10)/2,0])
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for(x=[0:58:58]){
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for(y=[0:10:10]){
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translate([x,y,0]) screw_hole();
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}
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}
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}
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module screw_hole(){
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translate([0,0,2]) cylinder(d=6,h=pt);
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cylinder(d=3,h=pt);
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}
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module arm_rests(){
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// long side from camera side
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hull(){
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translate([0.5+pizd[0]-33-3.5,0.5,pt]) cheese_slice(33,6,pinz,3);
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translate([0.5+pizd[0]-33/2-3.5,0.5,pt]) cube([33/2,6,pinz]);
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translate([pizd[0]-3.5,0.5+3,pt]) cylinder(d=6,h=pinz);
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}
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// short side from sd card slot side
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hull(){
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translate([0.5+3.5+2,0.5,pt]) cheese_slice(inch*.1,6,pinz,3);
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translate([0.5+3.5,0.5,pt]) cube([inch*.1/2,6,pinz]);
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translate([3.5,0.5+3,pt]) cylinder(d=6,h=pinz);
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}
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}
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module arm_rest_flap(){
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hull(){
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translate([0.5+pizd[0]-36.5-3.5,0.5+pizd[1]-7,pt]) cheese_slice(33,6,.4,1);
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translate([0.5+pizd[0]-36.5/2-3.5,0.5+pizd[1]-7,pt]) cube([33/2,6,.4]);
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translate([pizd[0]-3.5,0.5+3+pizd[1]-7,pt]) cylinder(d=6,h=.4);
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}
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// stand
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translate([26.5-1,pizd[1]-3.5-1,pt]) cheese_slice(3,4,pinz,1);
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}
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module cheese_slice(width,depth,height,radius){
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hull(){
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for(x=[0:width-radius:width-radius]){
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for(y=[0:depth-radius:depth-radius]){
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translate([x,y,0]+[radius,radius]/2) cylinder(d=radius, h=height);
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}
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}
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}
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}
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